EventBus基本使用

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1.首先添加依赖

compile 'org.greenrobot:eventbus:3.0.0'

2.我们要创建一个类，里面写我们要传送的属性

public class FirstEvent {    private String msg;    public FirstEvent(String msg) {        this.msg = msg;    }    public String getMsg() {        return msg;    }    public void setMsg(String msg) {        this.msg = msg;    }}

3.然后我们要在mainactivity中注册eventbus

public class MainActivity extends AppCompatActivity {    private Button button;    private TextView textView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (Button) findViewById(R.id.BT);        textView = (TextView) findViewById(R.id.TV);        //注册EventBus        EventBus.getDefault().register(this);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(MainActivity.this , MyActivity.class);                startActivity(intent);            }        });    }    //EventBus3.0必须要加上此注解 否则会报错    @Subscribe    public void  onEventMainThread(FirstEvent firstEvent){        String msg = "接收到的消息"+firstEvent.getMsg();        textView.setText(msg);        Toast.makeText(this, msg, Toast.LENGTH_LONG).show();    }    @Override    protected void onDestroy() {        super.onDestroy();        //解除注册        EventBus.getDefault().unregister(this);    }}

4.我们在另一个activity中用来发送消息

public class MyActivity extends AppCompatActivity {    private Button button;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_my);        button = (Button) findViewById(R.id.btn_first_event);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //发送消息                EventBus.getDefault().post(new FirstEvent("chen xue da sha bi"));                finish();            }        });    }}

5.两个布局主布局是一个button ， textview 另一个布局是一个button

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